การเขียนโค้ด Android เพื่ออ่านบัตรประชาชน ผ่าน Smart Card Reader

<uses-permission android:name="android.permission.USB_PERMISSION" /> <uses-feature android:name="android.hardware.usb.host" /> <application> <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device_filter" /> </application>

<?xml version="1.0" encoding="utf-8"?> <resources> <usb-device vendor-id="1839" product-id="8721" /> </resources>

import android.hardware.usb.*; import android.content.Context; public class SmartCardReader { private UsbManager usbManager; private UsbDevice device; private UsbDeviceConnection connection; private UsbEndpoint inEndpoint, outEndpoint; public SmartCardReader(Context context) { usbManager = (UsbManager) context.getSystemService(Context.USB_SERVICE); } public void connect(UsbDevice device) { this.device = device; if (!usbManager.hasPermission(device)) { // Implement permission dialog return; } UsbInterface usbInterface = device.getInterface(0); connection = usbManager.openDevice(device); connection.claimInterface(usbInterface, true); for (int i = 0; i < usbInterface.getEndpointCount(); i++) { UsbEndpoint endpoint = usbInterface.getEndpoint(i); if (endpoint.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) { if (endpoint.getDirection() == UsbConstants.USB_DIR_IN) { inEndpoint = endpoint; } else { outEndpoint = endpoint; } } } } public String sendApduCommand(byte[] command) { if (connection == null || outEndpoint == null || inEndpoint == null) { return "Device not connected"; } connection.bulkTransfer(outEndpoint, command, command.length, 5000); byte[] response = new byte[256]; int received = connection.bulkTransfer(inEndpoint, response, response.length, 5000); if (received > 0) { return bytesToHex(response, received); } return "No response"; } private String bytesToHex(byte[] bytes, int length) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { sb.append(String.format("%02X", bytes[i])); } return sb.toString(); } }

UsbDevice device = ... // ค้นหา UsbDevice ผ่าน usbManager.getDeviceList() SmartCardReader reader = new SmartCardReader(this); reader.connect(device); // ส่งคำสั่ง APDU เพื่อเลือกไฟล์ String response = reader.sendApduCommand( new byte[]{0x00, (byte) 0xA4, 0x00, 0x00, 0x02, 0x11, 0x11} ); Log.d("APDU Response", response);